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curl/lib/curl_sasl.c
Steve Holme b6821dbb91 sasl: Fixed Kerberos V5 inclusion when CURL_DISABLE_CRYPTO_AUTH is used 
Typically the USE_WINDOWS_SSPI definition would not be used when the
CURL_DISABLE_CRYPTO_AUTH define is, however, it is still a valid build
configuration and, as such, the SASL Kerberos V5 (GSSAPI) authentication
data structures and functions would incorrectly be used when they
shouldn't be.

Introduced a new USE_KRB5 definition that takes into account the use of
CURL_DISABLE_CRYPTO_AUTH like USE_SPNEGO and USE_NTLM do.
2014-11-02 00:35:16 +00:00

742 lines
23 KiB
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* RFC2195 CRAM-MD5 authentication
* RFC2831 DIGEST-MD5 authentication
* RFC4422 Simple Authentication and Security Layer (SASL)
* RFC4616 PLAIN authentication
* RFC6749 OAuth 2.0 Authorization Framework
* Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#include "urldata.h"
#include "curl_base64.h"
#include "curl_md5.h"
#include "vtls/vtls.h"
#include "curl_hmac.h"
#include "curl_ntlm_msgs.h"
#include "curl_sasl.h"
#include "warnless.h"
#include "curl_memory.h"
#include "strtok.h"
#include "rawstr.h"
#ifdef USE_NSS
#include "vtls/nssg.h" /* for Curl_nss_force_init() */
#endif
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
#if defined(USE_KRB5)
extern void Curl_sasl_gssapi_cleanup(struct kerberos5data *krb5);
#endif
#if !defined(CURL_DISABLE_CRYPTO_AUTH) && !defined(USE_WINDOWS_SSPI)
#define DIGEST_QOP_VALUE_AUTH (1 << 0)
#define DIGEST_QOP_VALUE_AUTH_INT (1 << 1)
#define DIGEST_QOP_VALUE_AUTH_CONF (1 << 2)
#define DIGEST_QOP_VALUE_STRING_AUTH "auth"
#define DIGEST_QOP_VALUE_STRING_AUTH_INT "auth-int"
#define DIGEST_QOP_VALUE_STRING_AUTH_CONF "auth-conf"
/* Retrieves the value for a corresponding key from the challenge string
* returns TRUE if the key could be found, FALSE if it does not exists
*/
static bool sasl_digest_get_key_value(const char *chlg,
const char *key,
char *value,
size_t max_val_len,
char end_char)
{
char *find_pos;
size_t i;
find_pos = strstr(chlg, key);
if(!find_pos)
return FALSE;
find_pos += strlen(key);
for(i = 0; *find_pos && *find_pos != end_char && i < max_val_len - 1; ++i)
value[i] = *find_pos++;
value[i] = '\0';
return TRUE;
}
static CURLcode sasl_digest_get_qop_values(const char *options, int *value)
{
char *tmp;
char *token;
char *tok_buf;
/* Initialise the output */
*value = 0;
/* Tokenise the list of qop values. Use a temporary clone of the buffer since
strtok_r() ruins it. */
tmp = strdup(options);
if(!tmp)
return CURLE_OUT_OF_MEMORY;
token = strtok_r(tmp, ",", &tok_buf);
while(token != NULL) {
if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH))
*value |= DIGEST_QOP_VALUE_AUTH;
else if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH_INT))
*value |= DIGEST_QOP_VALUE_AUTH_INT;
else if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH_CONF))
*value |= DIGEST_QOP_VALUE_AUTH_CONF;
token = strtok_r(NULL, ",", &tok_buf);
}
Curl_safefree(tmp);
return CURLE_OK;
}
#endif
#if !defined(USE_WINDOWS_SSPI)
/*
* Curl_sasl_build_spn()
*
* This is used to build a SPN string in the format service/host.
*
* Parameters:
*
* serivce [in] - The service type such as www, smtp, pop or imap.
* instance [in] - The instance name such as the host nme or realm.
*
* Returns a pointer to the newly allocated SPN.
*/
char *Curl_sasl_build_spn(const char *service, const char *host)
{
/* Generate and return our SPN */
return aprintf("%s/%s", service, host);
}
#endif
/*
* Curl_sasl_create_plain_message()
*
* This is used to generate an already encoded PLAIN message ready
* for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* userp [in] - The user name.
* passdwp [in] - The user's password.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_plain_message(struct SessionHandle *data,
const char *userp,
const char *passwdp,
char **outptr, size_t *outlen)
{
CURLcode result;
char *plainauth;
size_t ulen;
size_t plen;
ulen = strlen(userp);
plen = strlen(passwdp);
plainauth = malloc(2 * ulen + plen + 2);
if(!plainauth) {
*outlen = 0;
*outptr = NULL;
return CURLE_OUT_OF_MEMORY;
}
/* Calculate the reply */
memcpy(plainauth, userp, ulen);
plainauth[ulen] = '\0';
memcpy(plainauth + ulen + 1, userp, ulen);
plainauth[2 * ulen + 1] = '\0';
memcpy(plainauth + 2 * ulen + 2, passwdp, plen);
/* Base64 encode the reply */
result = Curl_base64_encode(data, plainauth, 2 * ulen + plen + 2, outptr,
outlen);
Curl_safefree(plainauth);
return result;
}
/*
* Curl_sasl_create_login_message()
*
* This is used to generate an already encoded LOGIN message containing the
* user name or password ready for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* valuep [in] - The user name or user's password.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_login_message(struct SessionHandle *data,
const char *valuep, char **outptr,
size_t *outlen)
{
size_t vlen = strlen(valuep);
if(!vlen) {
/* Calculate an empty reply */
*outptr = strdup("=");
if(*outptr) {
*outlen = (size_t) 1;
return CURLE_OK;
}
*outlen = 0;
return CURLE_OUT_OF_MEMORY;
}
/* Base64 encode the value */
return Curl_base64_encode(data, valuep, vlen, outptr, outlen);
}
#ifndef CURL_DISABLE_CRYPTO_AUTH
/*
* Curl_sasl_decode_cram_md5_message()
*
* This is used to decode an already encoded CRAM-MD5 challenge message.
*
* Parameters:
*
* chlg64 [in] - Pointer to the base64 encoded challenge message.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_decode_cram_md5_message(const char *chlg64, char **outptr,
size_t *outlen)
{
CURLcode result = CURLE_OK;
size_t chlg64len = strlen(chlg64);
*outptr = NULL;
*outlen = 0;
/* Decode the challenge if necessary */
if(chlg64len && *chlg64 != '=')
result = Curl_base64_decode(chlg64, (unsigned char **) outptr, outlen);
return result;
}
/*
* Curl_sasl_create_cram_md5_message()
*
* This is used to generate an already encoded CRAM-MD5 response message ready
* for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* chlg [in] - The challenge.
* userp [in] - The user name.
* passdwp [in] - The user's password.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_cram_md5_message(struct SessionHandle *data,
const char *chlg,
const char *userp,
const char *passwdp,
char **outptr, size_t *outlen)
{
CURLcode result = CURLE_OK;
size_t chlglen = 0;
HMAC_context *ctxt;
unsigned char digest[MD5_DIGEST_LEN];
char *response;
if(chlg)
chlglen = strlen(chlg);
/* Compute the digest using the password as the key */
ctxt = Curl_HMAC_init(Curl_HMAC_MD5,
(const unsigned char *) passwdp,
curlx_uztoui(strlen(passwdp)));
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
/* Update the digest with the given challenge */
if(chlglen > 0)
Curl_HMAC_update(ctxt, (const unsigned char *) chlg,
curlx_uztoui(chlglen));
/* Finalise the digest */
Curl_HMAC_final(ctxt, digest);
/* Generate the response */
response = aprintf(
"%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
userp, digest[0], digest[1], digest[2], digest[3], digest[4],
digest[5], digest[6], digest[7], digest[8], digest[9], digest[10],
digest[11], digest[12], digest[13], digest[14], digest[15]);
if(!response)
return CURLE_OUT_OF_MEMORY;
/* Base64 encode the response */
result = Curl_base64_encode(data, response, 0, outptr, outlen);
Curl_safefree(response);
return result;
}
#ifndef USE_WINDOWS_SSPI
/*
* sasl_decode_digest_md5_message()
*
* This is used internally to decode an already encoded DIGEST-MD5 challenge
* message into the seperate attributes.
*
* Parameters:
*
* chlg64 [in] - Pointer to the base64 encoded challenge message.
* nonce [in/out] - The buffer where the nonce will be stored.
* nlen [in] - The length of the nonce buffer.
* realm [in/out] - The buffer where the realm will be stored.
* rlen [in] - The length of the realm buffer.
* alg [in/out] - The buffer where the algorithm will be stored.
* alen [in] - The length of the algorithm buffer.
* qop [in/out] - The buffer where the qop-options will be stored.
* qlen [in] - The length of the qop buffer.
*
* Returns CURLE_OK on success.
*/
static CURLcode sasl_decode_digest_md5_message(const char *chlg64,
char *nonce, size_t nlen,
char *realm, size_t rlen,
char *alg, size_t alen,
char *qop, size_t qlen)
{
CURLcode result = CURLE_OK;
unsigned char *chlg = NULL;
size_t chlglen = 0;
size_t chlg64len = strlen(chlg64);
/* Decode the base-64 encoded challenge message */
if(chlg64len && *chlg64 != '=') {
result = Curl_base64_decode(chlg64, &chlg, &chlglen);
if(result)
return result;
}
/* Ensure we have a valid challenge message */
if(!chlg)
return CURLE_BAD_CONTENT_ENCODING;
/* Retrieve nonce string from the challenge */
if(!sasl_digest_get_key_value((char *)chlg, "nonce=\"", nonce, nlen, '\"')) {
Curl_safefree(chlg);
return CURLE_BAD_CONTENT_ENCODING;
}
/* Retrieve realm string from the challenge */
if(!sasl_digest_get_key_value((char *)chlg, "realm=\"", realm, rlen, '\"')) {
/* Challenge does not have a realm, set empty string [RFC2831] page 6 */
strcpy(realm, "");
}
/* Retrieve algorithm string from the challenge */
if(!sasl_digest_get_key_value((char *)chlg, "algorithm=", alg, alen, ',')) {
Curl_safefree(chlg);
return CURLE_BAD_CONTENT_ENCODING;
}
/* Retrieve qop-options string from the challenge */
if(!sasl_digest_get_key_value((char *)chlg, "qop=\"", qop, qlen, '\"')) {
Curl_safefree(chlg);
return CURLE_BAD_CONTENT_ENCODING;
}
Curl_safefree(chlg);
return CURLE_OK;
}
/*
* Curl_sasl_create_digest_md5_message()
*
* This is used to generate an already encoded DIGEST-MD5 response message
* ready for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* chlg64 [in] - Pointer to the base64 encoded challenge message.
* userp [in] - The user name.
* passdwp [in] - The user's password.
* service [in] - The service type such as www, smtp, pop or imap.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
const char *chlg64,
const char *userp,
const char *passwdp,
const char *service,
char **outptr, size_t *outlen)
{
CURLcode result = CURLE_OK;
size_t i;
MD5_context *ctxt;
char *response = NULL;
unsigned char digest[MD5_DIGEST_LEN];
char HA1_hex[2 * MD5_DIGEST_LEN + 1];
char HA2_hex[2 * MD5_DIGEST_LEN + 1];
char resp_hash_hex[2 * MD5_DIGEST_LEN + 1];
char nonce[64];
char realm[128];
char algorithm[64];
char qop_options[64];
int qop_values;
char cnonce[33];
unsigned int entropy[4];
char nonceCount[] = "00000001";
char method[] = "AUTHENTICATE";
char qop[] = DIGEST_QOP_VALUE_STRING_AUTH;
char *spn = NULL;
/* Decode the challange message */
result = sasl_decode_digest_md5_message(chlg64, nonce, sizeof(nonce),
realm, sizeof(realm),
algorithm, sizeof(algorithm),
qop_options, sizeof(qop_options));
if(result)
return result;
/* We only support md5 sessions */
if(strcmp(algorithm, "md5-sess") != 0)
return CURLE_BAD_CONTENT_ENCODING;
/* Get the qop-values from the qop-options */
result = sasl_digest_get_qop_values(qop_options, &qop_values);
if(result)
return result;
/* We only support auth quality-of-protection */
if(!(qop_values & DIGEST_QOP_VALUE_AUTH))
return CURLE_BAD_CONTENT_ENCODING;
/* Generate 16 bytes of random data */
entropy[0] = Curl_rand(data);
entropy[1] = Curl_rand(data);
entropy[2] = Curl_rand(data);
entropy[3] = Curl_rand(data);
/* Convert the random data into a 32 byte hex string */
snprintf(cnonce, sizeof(cnonce), "%08x%08x%08x%08x",
entropy[0], entropy[1], entropy[2], entropy[3]);
/* So far so good, now calculate A1 and H(A1) according to RFC 2831 */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) userp,
curlx_uztoui(strlen(userp)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) realm,
curlx_uztoui(strlen(realm)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) passwdp,
curlx_uztoui(strlen(passwdp)));
Curl_MD5_final(ctxt, digest);
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
Curl_MD5_update(ctxt, (const unsigned char *) digest, MD5_DIGEST_LEN);
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonce,
curlx_uztoui(strlen(nonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
curlx_uztoui(strlen(cnonce)));
Curl_MD5_final(ctxt, digest);
/* Convert calculated 16 octet hex into 32 bytes string */
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&HA1_hex[2 * i], 3, "%02x", digest[i]);
/* Generate our SPN */
spn = Curl_sasl_build_spn(service, realm);
if(!spn)
return CURLE_OUT_OF_MEMORY;
/* Calculate H(A2) */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt) {
Curl_safefree(spn);
return CURLE_OUT_OF_MEMORY;
}
Curl_MD5_update(ctxt, (const unsigned char *) method,
curlx_uztoui(strlen(method)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) spn,
curlx_uztoui(strlen(spn)));
Curl_MD5_final(ctxt, digest);
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&HA2_hex[2 * i], 3, "%02x", digest[i]);
/* Now calculate the response hash */
ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
if(!ctxt) {
Curl_safefree(spn);
return CURLE_OUT_OF_MEMORY;
}
Curl_MD5_update(ctxt, (const unsigned char *) HA1_hex, 2 * MD5_DIGEST_LEN);
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonce,
curlx_uztoui(strlen(nonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) nonceCount,
curlx_uztoui(strlen(nonceCount)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
curlx_uztoui(strlen(cnonce)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) qop,
curlx_uztoui(strlen(qop)));
Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
Curl_MD5_update(ctxt, (const unsigned char *) HA2_hex, 2 * MD5_DIGEST_LEN);
Curl_MD5_final(ctxt, digest);
for(i = 0; i < MD5_DIGEST_LEN; i++)
snprintf(&resp_hash_hex[2 * i], 3, "%02x", digest[i]);
/* Generate the response */
response = aprintf("username=\"%s\",realm=\"%s\",nonce=\"%s\","
"cnonce=\"%s\",nc=\"%s\",digest-uri=\"%s\",response=%s,"
"qop=%s",
userp, realm, nonce,
cnonce, nonceCount, spn, resp_hash_hex, qop);
Curl_safefree(spn);
if(!response)
return CURLE_OUT_OF_MEMORY;
/* Base64 encode the response */
result = Curl_base64_encode(data, response, 0, outptr, outlen);
Curl_safefree(response);
return result;
}
#endif /* !USE_WINDOWS_SSPI */
#endif /* CURL_DISABLE_CRYPTO_AUTH */
#ifdef USE_NTLM
/*
* Curl_sasl_create_ntlm_type1_message()
*
* This is used to generate an already encoded NTLM type-1 message ready for
* sending to the recipient.
*
* Note: This is a simple wrapper of the NTLM function which means that any
* SASL based protocols don't have to include the NTLM functions directly.
*
* Parameters:
*
* userp [in] - The user name in the format User or Domain\User.
* passdwp [in] - The user's password.
* ntlm [in/out] - The ntlm data struct being used and modified.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_ntlm_type1_message(const char *userp,
const char *passwdp,
struct ntlmdata *ntlm,
char **outptr, size_t *outlen)
{
return Curl_ntlm_create_type1_message(userp, passwdp, ntlm, outptr, outlen);
}
/*
* Curl_sasl_decode_ntlm_type2_message()
*
* This is used to decode an already encoded NTLM type-2 message.
*
* Parameters:
*
* data [in] - Pointer to session handle.
* type2msg [in] - Pointer to the base64 encoded type-2 message.
* ntlm [in/out] - The ntlm data struct being used and modified.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_decode_ntlm_type2_message(struct SessionHandle *data,
const char *type2msg,
struct ntlmdata *ntlm)
{
#ifdef USE_NSS
CURLcode result;
/* make sure the crypto backend is initialized */
result = Curl_nss_force_init(data);
if(result)
return result;
#endif
return Curl_ntlm_decode_type2_message(data, type2msg, ntlm);
}
/*
* Curl_sasl_create_ntlm_type3_message()
*
* This is used to generate an already encoded NTLM type-3 message ready for
* sending to the recipient.
*
* Parameters:
*
* data [in] - Pointer to session handle.
* userp [in] - The user name in the format User or Domain\User.
* passdwp [in] - The user's password.
* ntlm [in/out] - The ntlm data struct being used and modified.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_ntlm_type3_message(struct SessionHandle *data,
const char *userp,
const char *passwdp,
struct ntlmdata *ntlm,
char **outptr, size_t *outlen)
{
return Curl_ntlm_create_type3_message(data, userp, passwdp, ntlm, outptr,
outlen);
}
#endif /* USE_NTLM */
/*
* Curl_sasl_create_xoauth2_message()
*
* This is used to generate an already encoded OAuth 2.0 message ready for
* sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* user [in] - The user name.
* bearer [in] - The bearer token.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_xoauth2_message(struct SessionHandle *data,
const char *user,
const char *bearer,
char **outptr, size_t *outlen)
{
CURLcode result = CURLE_OK;
char *xoauth = NULL;
/* Generate the message */
xoauth = aprintf("user=%s\1auth=Bearer %s\1\1", user, bearer);
if(!xoauth)
return CURLE_OUT_OF_MEMORY;
/* Base64 encode the reply */
result = Curl_base64_encode(data, xoauth, strlen(xoauth), outptr, outlen);
Curl_safefree(xoauth);
return result;
}
/*
* Curl_sasl_cleanup()
*
* This is used to cleanup any libraries or curl modules used by the sasl
* functions.
*
* Parameters:
*
* conn [in] - Pointer to the connection data.
* authused [in] - The authentication mechanism used.
*/
void Curl_sasl_cleanup(struct connectdata *conn, unsigned int authused)
{
#if defined(USE_KRB5)
/* Cleanup the gssapi structure */
if(authused == SASL_MECH_GSSAPI) {
Curl_sasl_gssapi_cleanup(&conn->krb5);
}
#ifdef USE_NTLM
/* Cleanup the ntlm structure */
else if(authused == SASL_MECH_NTLM) {
Curl_ntlm_sspi_cleanup(&conn->ntlm);
}
#endif
#else
/* Reserved for future use */
(void)conn;
(void)authused;
#endif
}
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